#timepiece__timekeeper  a measuring instrument or device for keeping time
  supertype:  measuring_instrument__measuringinstrument__measuring_system__measuringsystem__measuring_device__measuringdevice  instrument that shows the extent or amount or quantity or degree of something
  subtype:  atomic_clock  clock  sandglass  sundial  timer  ticker
  part:  balance_wheel__balancewheel  a wheel oscillating against the hairspring of a timepiece to regulate its beat
  part:  dial  the face of a timepiece; graduated to show the hours
  part:  escapement  mechanical device that regulates movement
     part:  escape_wheel  gear that engages a rocking lever
  part:  hairspring  a fine spiral spring that regulates the movement of the balance wheel in a timepiece
  part:  hand  a rotating pointer on the face of a timepiece; "the big hand counts the minutes"
  part:  time-ball  a ball that slides down a staff to show a fixed time; especially at an observatory

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